Effect of Base Monomer's Refractive Index on Curing Depth and Polymerization Conversion of Photo-cured Resin Composites

Fujita, Kou; Nishiyama, Norihiro; Nemoto, Kimiya; Okada, Tamami; Ikemi, Takuji

doi:10.4012/dmj.24.403

Cited by 77 publications

(72 citation statements)

References 9 publications

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“…These properties of the microstructure also affect the overall refractive index of the composite material. It should be noted that in general, magnitude and direction of scattering depends on the average magnitude of refractive index fluctuation in the composite material 12) . Therefore, individual refractive indices of the dispersed phase (fillers) and matrix phase (resin) should be perfectly matched in order to obtain transluceny close to that of tooth tissue 12,13) .…”

Section: Introductionmentioning

confidence: 99%

“…It should be noted that in general, magnitude and direction of scattering depends on the average magnitude of refractive index fluctuation in the composite material 12) . Therefore, individual refractive indices of the dispersed phase (fillers) and matrix phase (resin) should be perfectly matched in order to obtain transluceny close to that of tooth tissue 12,13) . If this were not so, the tooth would have poor esthetical properties and reduced cure depth with visible light 14) .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Bleaching on Color Change and Refractive Index of Dental Composite Resins

Hubbezoğlu¹,

Akaoglu²,

Doğan³

et al. 2008

Dent. Mater. J.

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This study investigated the effects of three bleaching agents (Whiteness Perfect, Whiteness Super, and Whiteness HP) on the color change and refractive index of three dental composites (Admira, Durafill VS, and Gradia Direct). Twenty diskshaped specimens (10×2 mm) of each composite were prepared and divided into four subgroups (n=5). An unbleached group was used as a control, while the remaining specimens in the three subgroups were bleached with one of the bleaching agents respectively. Color change was assessed according to CIELAB color system and refractive indices were determined by phase modulated spectroscopic ellipsometry. Color differences between bleaching and baseline value (ΔE) were less than 3.3 for all groups. However, bleaching with Whiteness HP led to noticeable color changes for Admira and Durafill VS. While this agent had no effect on the refractive indices of these composites, the other two agents containing carbamide peroxide increased their refractive indices. Therefore, results suggested that replacement of such composite restorations may be required after bleaching.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Bleaching on Color Change and Refractive Index of Dental Composite Resins

Hubbezoğlu¹,

Akaoglu²,

Doğan³

et al. 2008

Dent. Mater. J.

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“…From the results, the filler loading of centrifuged composites was demonstrated to be affected by monomer type and total filler content. Regarding monomer type, characteristics of the base monomer have an effect on post-curing properties including TANOUE et al 503 polymerization conversion 16) . Conventional composites commonly include such main monomers as 2,2-bis [4-(2-hydroxy-3-methacryloyloxy-propoxy) phenyl] propane (Bis-GMA), UDMA, Bis-MPEPP, and their variations.…”

Section: Discussionmentioning

confidence: 99%

Effects of Monomer Composition and Original Filler Content on Filler Loading in the Resulting Centrifuged Composites

et al. 2007

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This study examined the effects of monomer composition, original filler content, and application of centrifugal force on the resulting filler loading of composites. Either Bis-MPEPP or UDMA was mixed with TEGDMA at a molar ratio of 1：1. Silane-treated silica (14 -20 wt％) was added to each mixture. After the mixtures were centrifuged and light-polymerized, rate of increase was determined as the filler increment of 2.0-mm-high, disk-shaped sections of specimen when compared against the uncentrifuged filler content. Both the original filler loading and monomer composition influenced the filler content of the centrifuged composites. Fillers in Bis-MPEPP-based composites exhibited a higher rate of condensation after application of centrifugal force than did UDMA-based composites. The results were suggestive of underlying relationships among the composition, component stability, and post-polymerization properties of flowable composites.

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“…The use of ytterbium trifluoride would increase the translucency of the composites relative to the use of barium glass alone. 34 Arikawa and others 35 reported that materials with small, irregularly-shaped fillers showed greater %T than those with large, spherically-shaped fillers. Dos Santos and others 25 reported that a composite containing 20 nm filler showed greater %T than that containing 0.6 lm filler.…”

Section: E86mentioning

confidence: 99%

“…Previous reports indicated that the material translucency was high when the refractive indexes of the resin matrix and filler were similar. 34 In TC, barium glass and ytterbium trifluoride provide the radiopacity, with refractive indexes of 1.98 and 1.53, respectively. As the refractive indexes of the resin monomer are between 1.49 and 1.56, the resin monomer is more similar to ytterbium trifluoride than barium glass in terms of refractive index.…”

Section: E86mentioning

confidence: 99%

Evaluation of Resin Composite Translucency by Two Different Methods

Kim¹,

Park

2013

Operative Dentistry

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Composite translucency varies by manufacturer. This information should be considered when selecting materials and clinical techniques to improve clinical performance. SUMMARYThe purpose of this study was 1) to compare the translucency of seven different types of composite materials and three different shade categories (dentin, enamel, and translucent) by determining the translucency parameter (TP) and light transmittance (%T) and 2) to evaluate the correlation between the results of the two evaluation methods. ) from different manufacturers were screened in this study. Ten disk-shaped specimens (10 mm in diameter and 1 mm in thickness) were prepared for each material. For the TP measurements, the colors of each specimen were recorded according to the CIELAB color scale against white and black backgrounds with a colorimeter and used to calculate the TP value. For the %T measurements, the mean direct transmittance through the specimen in the range between 380 and 780 nm was recorded using a spectrometer and computer software. Two-way analysis of variance (ANOVA) tests were performed to compare the TP and %T for the composite materials and shade categories. One-way ANOVA and Tukey tests were used for the seven composite materials per shade category and the three shade categories per composite material. The correlation between the two evaluation methods was determined using the Pearson correlation coefficient. All statistical procedures were performed within a 95% confidence level. TP differed significantly by composite material within each shade category (p,0.05) and by shade category within each composite material (p,0.05). %T differed significantly by composite material within each shade category (p,0.05) and by shade categories within each composite material (p,0.05), except for BF and ES. For the two evaluation methods, TP and %T, were positively correlated (r=0.626, p,0.05). These methods showed strong correlation for each composite

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Effect of Base Monomer's Refractive Index on Curing Depth and Polymerization Conversion of Photo-cured Resin Composites

Cited by 77 publications

References 9 publications

Effect of Bleaching on Color Change and Refractive Index of Dental Composite Resins

Effect of Bleaching on Color Change and Refractive Index of Dental Composite Resins

Effects of Monomer Composition and Original Filler Content on Filler Loading in the Resulting Centrifuged Composites

Evaluation of Resin Composite Translucency by Two Different Methods

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